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These include roads in the United Kingdom,[1] the United States,[2] and UK and US territories; American Samoa,[3] the Bahamas,[4] Belize,[5] British Virgin Islands,[6] the Cayman Islands,[7] Dominica,[8] the Falkland Islands,[9] Grenada,[10] Guam,[11] Burma,[12] The N. Mariana Islands,[13] Samoa,[14] St. Lucia,[15] St. Vincent & The Grenadines,[16] St. Helena,[17] St. Kitts & Nevis,[18] Turks & Caicos Islands,[19] the U.S. Virgin Islands,[20][21] Antigua & Barbuda (although km are used for distance),[22] and Puerto Rico (same as former).[22]

United States road sign with maximum speed noted in standard Mph

Miles per hour are also used in the Canadian rail system.[23] In some countries it may be used to express the speed of delivery of a ball in sporting events such as cricket, tennis and baseball.

Road traffic speeds in other countries are quoted in kilometres per hour. Occasionally, however, both systems are used: for example, in Ireland, a judge considered a speeding case by examining speeds in both kilometres per hour and miles per hour. The judge was quoted as saying the speed seemed "very excessive" at 180 km/h but did not look "as bad" at 112 mph; a reduced fine was still imposed on the speeding driver.[24]

^"Modern Living: Think Metric". Time Magazine. 9 June 1975. Retrieved 15 June 2010. Meanwhile, the metricization of America is already taking place. Individual federal agencies, school systems, states and industries, as well as radio announcers, supermarkets, beverage bottlers and ballpark scoreboards, are hastening the everyday use of meters, liters and grams. ...a road sign outside Fergus Falls reads, ST. CLOUD 100 MILES OR 161 KILOMETERS. Other signs note that 55 m.p.h. equals 88 kilometers per hour.